Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/148cf9c8c177
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #12269 from gtorodelvalle/dialer-bug-910188-closing-contact-list

Dialer bug 910188 closing contact list (r=jmcanterafonseca)(cherry picked from commit 30f92b6b041db172c34059d9e7878d8730b5b4ca)

Conflicts:
	apps/communications/contacts/js/views/list.js